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BGP: Make TCP listener VRF aware (#407)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,145 @@ | ||
| package tcp | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "net" | ||
| "sync" | ||
|
|
||
| "github.com/bio-routing/bio-rd/routingtable/vrf" | ||
| "github.com/bio-routing/bio-rd/util/log" | ||
| ) | ||
|
|
||
| type ConnWithVRF struct { | ||
| Conn net.Conn | ||
| VRF *vrf.VRF | ||
| } | ||
|
|
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| type ListenerManagerI interface { | ||
| ListenAddrsPerVRF(vrf *vrf.VRF) []string | ||
| GetListeners(v *vrf.VRF) []ListenerI | ||
| CreateListenersIfNotExists(v *vrf.VRF) error | ||
| AcceptCh() chan ConnWithVRF | ||
| } | ||
|
|
||
| type ListenerManager struct { | ||
| listenAddrsByVRF map[string][]string | ||
| listenersByVRF map[string][]ListenerI | ||
| listenersByVRFmu sync.RWMutex | ||
| acceptCh chan ConnWithVRF | ||
| listenerFactory ListenerFactoryI | ||
| } | ||
|
|
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| func NewListenerManager(listenAddrsByVRF map[string][]string) *ListenerManager { | ||
| return &ListenerManager{ | ||
| listenAddrsByVRF: listenAddrsByVRF, | ||
| listenersByVRF: make(map[string][]ListenerI), | ||
| listenerFactory: NewListenerFactory(), | ||
| } | ||
| } | ||
|
|
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| func (lm *ListenerManager) ListenAddrsPerVRF(vrf *vrf.VRF) []string { | ||
| return lm.listenAddrsByVRF[vrf.Name()] | ||
| } | ||
|
|
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| func (lm *ListenerManager) GetListeners(v *vrf.VRF) []ListenerI { | ||
| lm.listenersByVRFmu.Lock() | ||
| defer lm.listenersByVRFmu.Unlock() | ||
|
|
||
| ret := make([]ListenerI, 0) | ||
| for _, l := range lm.listenersByVRF[v.Name()] { | ||
| ret = append(ret, l) | ||
| } | ||
|
|
||
| return ret | ||
| } | ||
|
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| func (lm *ListenerManager) CreateListenersIfNotExists(v *vrf.VRF) error { | ||
| lm.listenersByVRFmu.Lock() | ||
| defer lm.listenersByVRFmu.Unlock() | ||
|
|
||
| if _, exists := lm.listenersByVRF[v.Name()]; exists { | ||
| return nil | ||
| } | ||
|
|
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| err := lm._createListeners(v) | ||
| if err != nil { | ||
| return fmt.Errorf("unable to create listeners: %v", err) | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
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| func (lm *ListenerManager) _createListeners(v *vrf.VRF) error { | ||
| for _, addr := range lm.ListenAddrsPerVRF(v) { | ||
| err := lm._addListener(v, addr, lm.acceptCh) | ||
| if err != nil { | ||
| return fmt.Errorf("unable to create TCP listener %q vrf %s: %v", addr, v.Name(), err) | ||
| } | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
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| // newListener creates a new Listener | ||
| func (lm *ListenerManager) _addListener(vrf *vrf.VRF, addr string, ch chan ConnWithVRF) error { | ||
| tcpaddr, err := net.ResolveTCPAddr("tcp", addr) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| log.Infof("Listener manager: Starting TCP listener on %s in VRF %s", addr, vrf.Name()) | ||
| l, err := lm.listenerFactory.NewListener(vrf, tcpaddr, 255) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| lm._add(vrf, l) | ||
|
|
||
| go func(tl ListenerI) error { | ||
| defer lm.dropListener(vrf, tl) | ||
|
|
||
| for { | ||
| conn, err := l.AcceptTCP() | ||
| if err != nil { | ||
| log.WithError(err).WithFields(log.Fields{ | ||
| "Topic": "Peer", | ||
| }).Error("Failed to AcceptTCP") | ||
| return err | ||
| } | ||
|
|
||
| ch <- ConnWithVRF{ | ||
| Conn: conn, | ||
| VRF: vrf, | ||
| } | ||
| } | ||
| }(l) | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| // _add is to be called with the mutex acquired | ||
| func (lm *ListenerManager) _add(vrf *vrf.VRF, l ListenerI) { | ||
| if _, exists := lm.listenersByVRF[vrf.Name()]; !exists { | ||
| lm.listenersByVRF[vrf.Name()] = make([]ListenerI, 0) | ||
| } | ||
|
|
||
| lm.listenersByVRF[vrf.Name()] = append(lm.listenersByVRF[vrf.Name()], l) | ||
| } | ||
|
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| func (lm *ListenerManager) dropListener(vrf *vrf.VRF, l ListenerI) { | ||
| lm.listenersByVRFmu.Lock() | ||
| defer lm.listenersByVRFmu.Unlock() | ||
|
|
||
| vrfName := vrf.Name() | ||
| listeners := lm.listenersByVRF[vrfName] | ||
| for i, x := range listeners { | ||
| if x == l { | ||
| lm.listenersByVRF[vrfName] = append(listeners[:i], listeners[i+1:]...) | ||
| return | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func (lm *ListenerManager) AcceptCh() chan ConnWithVRF { | ||
| return lm.acceptCh | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,3 @@ | ||
| package tcp | ||
|
|
||
| const BGPPORT = 179 |
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